Working principle of self-priming centrifugal pump

The reason why a self-priming centrifugal pump can send water out is due to the effect of centrifugal force. Before the water pump starts working, the pump body and inlet pipe must be filled with water to form a vacuum state. When the impeller rotates rapidly, the blades cause the water to rotate quickly, and the rotating water flies away from the impeller under the action of centrifugal force. After the water in the pump is thrown out, a vacuum zone is formed in the central part of the impeller. The water from the pump is pressurized into the inlet pipe through the pipeline network under the action of atmospheric pressure (or water pressure). By continuously cycling in this way, continuous pumping can be achieved. It is worth mentioning that before starting the self-priming centrifugal pump, it is necessary to fill the pump casing with water, otherwise it will cause the pump body to heat up, vibrate, reduce the water output, and damage the pump (referred to as "cavitation"), resulting in equipment accidents!